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#include <stdint.h>
#include <stdbool.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/wdt.h>
#include <util/delay.h>
#include "bootloader.h"
#ifdef PROTOCOL_LUFA
#include <LUFA/Drivers/USB/USB.h>
#endif
/* Boot Section Size in *BYTEs*
* Teensy halfKay 512
* Teensy++ halfKay 1024
* Atmel DFU loader 4096
* LUFA bootloader 4096
* USBaspLoader 2048
*/
#ifndef BOOTLOADER_SIZE
#warning To use bootloader_jump() you need to define BOOTLOADER_SIZE in config.h.
#define BOOTLOADER_SIZE 4096
#endif
#define FLASH_SIZE (FLASHEND + 1L)
#define BOOTLOADER_START (FLASH_SIZE - BOOTLOADER_SIZE)
/*
* Entering the Bootloader via Software
* http://www.fourwalledcubicle.com/files/LUFA/Doc/120730/html/_page__software_bootloader_start.html
*/
#define BOOTLOADER_RESET_KEY 0xB007B007
uint32_t reset_key __attribute__ ((section (".noinit")));
/* initialize MCU status by watchdog reset */
void bootloader_jump(void) {
#ifdef PROTOCOL_LUFA
USB_Disable();
cli();
_delay_ms(2000);
#endif
#ifdef PROTOCOL_PJRC
cli();
UDCON = 1;
USBCON = (1<<FRZCLK);
UCSR1B = 0;
_delay_ms(5);
#endif
// watchdog reset
reset_key = BOOTLOADER_RESET_KEY;
wdt_enable(WDTO_250MS);
for (;;);
}
/* this runs before main() */
void bootloader_jump_after_watchdog_reset(void) __attribute__ ((used, naked, section (".init3")));
void bootloader_jump_after_watchdog_reset(void)
{
if ((MCUSR & (1<<WDRF)) && reset_key == BOOTLOADER_RESET_KEY) {
reset_key = 0;
// My custom USBasploader requires this to come up.
MCUSR = 0;
// Seems like Teensy halfkay loader requires clearing WDRF and disabling watchdog.
MCUSR &= ~(1<<WDRF);
wdt_disable();
// This is compled into 'icall', address should be in word unit, not byte.
((void (*)(void))(BOOTLOADER_START/2))();
}
}
#if 0
/* Jumping To The Bootloader
* http://www.pjrc.com/teensy/jump_to_bootloader.html
*
* This method doen't work when using LUFA. idk why.
* - needs to initialize more regisers or interrupt setting?
*/
void bootloader_jump(void) {
#ifdef PROTOCOL_LUFA
USB_Disable();
cli();
_delay_ms(2000);
#endif
#ifdef PROTOCOL_PJRC
cli();
UDCON = 1;
USBCON = (1<<FRZCLK);
UCSR1B = 0;
_delay_ms(5);
#endif
/*
* Initialize
*/
#if defined(__AVR_AT90USB162__)
EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0;
TIMSK0 = 0; TIMSK1 = 0; UCSR1B = 0;
DDRB = 0; DDRC = 0; DDRD = 0;
PORTB = 0; PORTC = 0; PORTD = 0;
#elif defined(__AVR_ATmega32U4__)
EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
TIMSK0 = 0; TIMSK1 = 0; TIMSK3 = 0; TIMSK4 = 0; UCSR1B = 0; TWCR = 0;
DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0; TWCR = 0;
PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
#elif defined(__AVR_AT90USB646__)
EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
#elif defined(__AVR_AT90USB1286__)
EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
#endif
/*
* USBaspLoader
*/
#if defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328P__)
// This makes custom USBasploader come up.
MCUSR = 0;
// initialize ports
PORTB = 0; PORTC= 0; PORTD = 0;
DDRB = 0; DDRC= 0; DDRD = 0;
// disable interrupts
EIMSK = 0; EECR = 0; SPCR = 0;
ACSR = 0; SPMCSR = 0; WDTCSR = 0; PCICR = 0;
TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0;
ADCSRA = 0; TWCR = 0; UCSR0B = 0;
#endif
// This is compled into 'icall', address should be in word unit, not byte.
((void (*)(void))(BOOTLOADER_START/2))();
}
#endif
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